Fix TempFileCache/LauncherTempFileCache (regression commit: 1468286bf569a493e4fdb887d5f3732f88c8cec3) 'update' scenario in same JVM instance.v2.0-rc9

TempFileCache/LauncherTempFileCache were using the system property
'jnlp.jogamp.tmp.cache.root', if set.

However, in case one JVM launched an old GlueGen (Applet)
and then launching a new GlueGen (Applet) w/ a new tmpDir location,
the property is still set but the tmpRootDir location does not exist.
This patch tolerates this situation and cont. setting a new tmpRootDir.
Example:
  JVM1.GlueGen1 tmpDir: /tmp/,             tmpRootDir: /tmp/jogamp.tmp.cache_000000/
  JVM1.GlueGen2 tmpDir: /tmp/jogamp_0000/, tmpRootDir: /tmp/jogamp_0000/file_cache/

Misc:
  - IOUtil: Always use 'jogamp_xxxx' as the sys-temp subfolder for tmpDir
  - JNILibLoaderBase: Remove unised import
  - TempJarCache.validateCertificates(): Add OK DEBUG output.

1 files changed, 0 insertions, 1 deletions

diff --git a/src/java/com/jogamp/common/jvm/JNILibLoaderBase.java b/src/java/com/jogamp/common/jvm/JNILibLoaderBase.java
index 32f5101..60f3060 100644
--- a/src/java/com/jogamp/common/jvm/JNILibLoaderBase.java
+++ b/src/java/com/jogamp/common/jvm/JNILibLoaderBase.java
@@ -47,7 +47,6 @@ import java.security.PrivilegedAction;
 import java.util.HashSet;
 
 import com.jogamp.common.os.NativeLibrary;
-import com.jogamp.common.os.Platform;
 import com.jogamp.common.util.JarUtil;
 import com.jogamp.common.util.PropertyAccess;
 import com.jogamp.common.util.cache.TempJarCache;